726091fea5
Right now on linux, an empty executable with LTO still depends on librt becaues of the clock_gettime function in rust_builtin.o, but this commit moves this dependency into a rust function which is subject to elimination via LTO. At the same time, this also drops libstd's dependency on librt on unices that are not OSX because the library is only used by extra::time (and now the dependency is listed in that module instead).
44 lines
1.3 KiB
Rust
44 lines
1.3 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! This module contains the linkage attributes to all runtime dependencies of
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//! the standard library This varies per-platform, but these libraries are
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//! necessary for running libstd.
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// All platforms need to link to rustrt
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#[link(name = "rustrt", kind = "static")]
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extern {}
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// LLVM implements the `frem` instruction as a call to `fmod`, which lives in
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// libm. Hence, we must explicitly link to it.
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//
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// On linux librt and libdl are indirect dependencies via rustrt,
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// and binutils 2.22+ won't add them automatically
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#[cfg(target_os = "linux")]
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#[link(name = "dl")]
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#[link(name = "m")]
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#[link(name = "pthread")]
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extern {}
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#[cfg(target_os = "android")]
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#[link(name = "dl")]
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#[link(name = "log")]
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#[link(name = "m")]
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extern {}
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#[cfg(target_os = "freebsd")]
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#[link(name = "execinfo")]
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#[link(name = "pthread")]
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extern {}
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#[cfg(target_os = "macos")]
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#[link(name = "pthread")]
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extern {}
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